/* * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * (c) Copyright 1998 Building Number Three Ltd * * Development of this driver was funded by Equiinet Ltd * http://www.equiinet.com * * ChangeLog: * * Asynchronous mode dropped for 2.2. For 2.3 we will attempt the * unification of all the Z85x30 asynchronous drivers for real. * * To Do: * * Finish DMA mode support. * * Performance * * Z85230: * Non DMA you want a 486DX50 or better to do 64Kbits. 9600 baud * X.25 is not unrealistic on all machines. DMA mode can in theory * handle T1/E1 quite nicely. * * Z85C30: * 64K will take DMA, 9600 baud X.25 should be ok. * * Z8530: * Synchronous mode without DMA is unlikely to pass about 2400 baud. */ #include #include #include #include #include #include #include #include #include #include #include #define RT_LOCK #define RT_UNLOCK #include #include "z85230.h" #include "syncppp.h" static spinlock_t z8530_buffer_lock = SPIN_LOCK_UNLOCKED; /* * Provided port access methods. The Comtrol SV11 requires no delays * between accesses and uses PC I/O. Some drivers may need a 5uS delay */ extern __inline__ int z8530_read_port(int p) { u8 r=inb(Z8530_PORT_OF(p)); if(p&Z8530_PORT_SLEEP) /* gcc should figure this out efficiently ! */ udelay(5); return r; } extern __inline__ void z8530_write_port(int p, u8 d) { outb(d,Z8530_PORT_OF(p)); if(p&Z8530_PORT_SLEEP) udelay(5); } static void z8530_rx_done(struct z8530_channel *c); static void z8530_tx_done(struct z8530_channel *c); /* * Port accesses */ extern inline u8 read_zsreg(struct z8530_channel *c, u8 reg) { u8 r; unsigned long flags; save_flags(flags); cli(); if(reg) z8530_write_port(c->ctrlio, reg); r=z8530_read_port(c->ctrlio); restore_flags(flags); return r; } extern inline u8 read_zsdata(struct z8530_channel *c) { u8 r; r=z8530_read_port(c->dataio); return r; } extern inline void write_zsreg(struct z8530_channel *c, u8 reg, u8 val) { unsigned long flags; save_flags(flags); cli(); if(reg) z8530_write_port(c->ctrlio, reg); z8530_write_port(c->ctrlio, val); restore_flags(flags); } extern inline void write_zsctrl(struct z8530_channel *c, u8 val) { z8530_write_port(c->ctrlio, val); } extern inline void write_zsdata(struct z8530_channel *c, u8 val) { z8530_write_port(c->dataio, val); } /* * Register loading parameters for a dead port */ u8 z8530_dead_port[]= { 255 }; EXPORT_SYMBOL(z8530_dead_port); /* * Register loading parameters for currently supported circuit types */ /* * Data clocked by telco end. This is the correct data for the UK * "kilostream" service, and most other similar services. */ u8 z8530_hdlc_kilostream[]= { 4, SYNC_ENAB|SDLC|X1CLK, 2, 0, /* No vector */ 1, 0, 3, ENT_HM|RxCRC_ENAB|Rx8, 5, TxCRC_ENAB|RTS|TxENAB|Tx8|DTR, 9, 0, /* Disable interrupts */ 6, 0xFF, 7, FLAG, 10, ABUNDER|NRZ|CRCPS,/*MARKIDLE ??*/ 11, TCTRxCP, 14, DISDPLL, 15, DCDIE|SYNCIE|CTSIE|TxUIE|BRKIE, 1, EXT_INT_ENAB|TxINT_ENAB|INT_ALL_Rx, 9, NV|MIE|NORESET, 255 }; EXPORT_SYMBOL(z8530_hdlc_kilostream); /* * As above but for enhanced chips. */ u8 z8530_hdlc_kilostream_85230[]= { 4, SYNC_ENAB|SDLC|X1CLK, 2, 0, /* No vector */ 1, 0, 3, ENT_HM|RxCRC_ENAB|Rx8, 5, TxCRC_ENAB|RTS|TxENAB|Tx8|DTR, 9, 0, /* Disable interrupts */ 6, 0xFF, 7, FLAG, 10, ABUNDER|NRZ|CRCPS, /* MARKIDLE?? */ 11, TCTRxCP, 14, DISDPLL, 15, DCDIE|SYNCIE|CTSIE|TxUIE|BRKIE, 1, EXT_INT_ENAB|TxINT_ENAB|INT_ALL_Rx, 9, NV|MIE|NORESET, 23, 3, /* Extended mode AUTO TX and EOM*/ 31, 3, /* Extended mode AUTO TX and EOM*/ 255 }; EXPORT_SYMBOL(z8530_hdlc_kilostream_85230); /* * Flush the FIFO */ static void z8530_flush_fifo(struct z8530_channel *c) { read_zsreg(c, R1); read_zsreg(c, R1); read_zsreg(c, R1); read_zsreg(c, R1); if(c->dev->type==Z85230) { read_zsreg(c, R1); read_zsreg(c, R1); read_zsreg(c, R1); read_zsreg(c, R1); } } /* Sets or clears DTR/RTS on the requested line */ static void z8530_rtsdtr(struct z8530_channel *c, int set) { if (set) c->regs[5] |= (RTS | DTR); else c->regs[5] &= ~(RTS | DTR); write_zsreg(c, R5, c->regs[5]); } /* * Receive handler. This is much like the async one but not quite the * same or as complex * * Note: Its intended that this handler can easily be separated from * the main code to run realtime. That'll be needed for some machines * (eg to ever clock 64kbits on a sparc ;)). * * The RT_LOCK macros don't do anything now. Keep the code covered * by them as short as possible in all circumstances - clocks cost * baud. The interrupt handler is assumed to be atomic w.r.t. to * other code - this is true in the RT case too. * * We only cover the sync cases for this. If you want 2Mbit async * do it yourself but consider medical assistance first. * * This non DMA synchronous mode is portable code. */ static void z8530_rx(struct z8530_channel *c) { u8 ch,stat; while(1) { /* FIFO empty ? */ if(!(read_zsreg(c, R0)&1)) break; ch=read_zsdata(c); stat=read_zsreg(c, R1); /* * Overrun ? */ if(c->count < c->max) { *c->dptr++=ch; c->count++; } if(stat&END_FR) { /* * Error ? */ if(stat&(Rx_OVR|CRC_ERR)) { /* Rewind the buffer and return */ if(c->skb) c->dptr=c->skb->data; c->count=0; if(stat&Rx_OVR) { printk(KERN_WARNING "%s: overrun\n", c->dev->name); c->rx_overrun++; } if(stat&CRC_ERR) { c->rx_crc_err++; /* printk("crc error\n"); */ } /* Shove the frame upstream */ } else { z8530_rx_done(c); write_zsctrl(c, RES_Rx_CRC); } } } /* * Clear irq */ write_zsctrl(c, ERR_RES); write_zsctrl(c, RES_H_IUS); } /* * Z8530 transmit interrupt handler */ static void z8530_tx(struct z8530_channel *c) { while(c->txcount) { /* FIFO full ? */ if(!(read_zsreg(c, R0)&4)) break; c->txcount--; /* * Shovel out the byte */ write_zsreg(c, R8, *c->tx_ptr++); write_zsctrl(c, RES_H_IUS); /* We are about to underflow */ if(c->txcount==0) { write_zsctrl(c, RES_EOM_L); write_zsreg(c, R10, c->regs[10]&~ABUNDER); } return; } /* * End of frame TX - fire another one */ write_zsctrl(c, RES_Tx_P); z8530_tx_done(c); /* write_zsreg(c, R8, *c->tx_ptr++); */ write_zsctrl(c, RES_H_IUS); } static void z8530_status(struct z8530_channel *chan) { u8 status=read_zsreg(chan, R0); u8 altered=chan->status^status; chan->status=status; if(status&TxEOM) { /* printk("%s: Tx underrun.\n", chan->dev->name); */ chan->stats.tx_fifo_errors++; write_zsctrl(chan, ERR_RES); z8530_tx_done(chan); } if(altered&DCD) { if(status&DCD) { printk(KERN_INFO "%s: DCD raised\n", chan->dev->name); write_zsreg(chan, R3, chan->regs[3]|RxENABLE); if(chan->netdevice) sppp_reopen(chan->netdevice); } else { printk(KERN_INFO "%s: DCD lost\n", chan->dev->name); write_zsreg(chan, R3, chan->regs[3]&~RxENABLE); z8530_flush_fifo(chan); } } write_zsctrl(chan, RES_EXT_INT); write_zsctrl(chan, RES_H_IUS); } struct z8530_irqhandler z8530_sync= { z8530_rx, z8530_tx, z8530_status }; EXPORT_SYMBOL(z8530_sync); /* * Non bus mastering DMA interfaces for the Z8x30 devices. This * is really pretty PC specific. */ static void z8530_dma_rx(struct z8530_channel *chan) { if(chan->rxdma_on) { /* Special condition check only */ u8 status; read_zsreg(chan, R7); read_zsreg(chan, R6); status=read_zsreg(chan, R1); if(status&END_FR) { z8530_rx_done(chan); /* Fire up the next one */ } write_zsctrl(chan, ERR_RES); write_zsctrl(chan, RES_H_IUS); } else { /* DMA is off right now, drain the slow way */ z8530_rx(chan); } } static void z8530_dma_tx(struct z8530_channel *chan) { if(!chan->dma_tx) { printk("Hey who turned the DMA off?\n"); z8530_tx(chan); return; } /* This shouldnt occur in DMA mode */ printk(KERN_ERR "DMA tx ??\n"); z8530_tx(chan); } static void z8530_dma_status(struct z8530_channel *chan) { unsigned long flags; u8 status=read_zsreg(chan, R0); u8 altered=chan->status^status; chan->status=status; if(chan->dma_tx) { if(status&TxEOM) { flags=claim_dma_lock(); /* Transmit underrun */ disable_dma(chan->txdma); clear_dma_ff(chan->txdma); chan->txdma_on=0; release_dma_lock(flags); z8530_tx_done(chan); } } if(altered&DCD) { if(status&DCD) { printk(KERN_INFO "%s: DCD raised\n", chan->dev->name); write_zsreg(chan, R3, chan->regs[3]|RxENABLE); if(chan->netdevice) sppp_reopen(chan->netdevice); } else { printk(KERN_INFO "%s:DCD lost\n", chan->dev->name); write_zsreg(chan, R3, chan->regs[3]&~RxENABLE); z8530_flush_fifo(chan); } } write_zsctrl(chan, RES_EXT_INT); write_zsctrl(chan, RES_H_IUS); } struct z8530_irqhandler z8530_dma_sync= { z8530_dma_rx, z8530_dma_tx, z8530_dma_status }; EXPORT_SYMBOL(z8530_dma_sync); struct z8530_irqhandler z8530_txdma_sync= { z8530_rx, z8530_dma_tx, z8530_dma_status }; EXPORT_SYMBOL(z8530_txdma_sync); /* * Interrupt vectors for a Z8530 that is in 'parked' mode. * For machines with PCI Z85x30 cards, or level triggered interrupts * (eg the MacII) we must clear the interrupt cause or die. */ static void z8530_rx_clear(struct z8530_channel *c) { /* * Data and status bytes */ u8 stat; read_zsdata(c); stat=read_zsreg(c, R1); if(stat&END_FR) write_zsctrl(c, RES_Rx_CRC); /* * Clear irq */ write_zsctrl(c, ERR_RES); write_zsctrl(c, RES_H_IUS); } static void z8530_tx_clear(struct z8530_channel *c) { write_zsctrl(c, RES_Tx_P); write_zsctrl(c, RES_H_IUS); } static void z8530_status_clear(struct z8530_channel *chan) { u8 status=read_zsreg(chan, R0); if(status&TxEOM) write_zsctrl(chan, ERR_RES); write_zsctrl(chan, RES_EXT_INT); write_zsctrl(chan, RES_H_IUS); } struct z8530_irqhandler z8530_nop= { z8530_rx_clear, z8530_tx_clear, z8530_status_clear }; EXPORT_SYMBOL(z8530_nop); /* * A Z85[2]30 device has stuck its hand in the air for attention */ void z8530_interrupt(int irq, void *dev_id, struct pt_regs *regs) { struct z8530_dev *dev=dev_id; u8 intr; static volatile int locker=0; int work=0; if(locker) { printk(KERN_ERR "IRQ re-enter\n"); return; } locker=1; while(++work<5000) { struct z8530_irqhandler *irqs=dev->chanA.irqs; intr = read_zsreg(&dev->chanA, R3); if(!(intr & (CHARxIP|CHATxIP|CHAEXT|CHBRxIP|CHBTxIP|CHBEXT))) break; /* This holds the IRQ status. On the 8530 you must read it from chan A even though it applies to the whole chip */ /* Now walk the chip and see what it is wanting - it may be an IRQ for someone else remember */ if(intr & (CHARxIP|CHATxIP|CHAEXT)) { if(intr&CHARxIP) irqs->rx(&dev->chanA); if(intr&CHATxIP) irqs->tx(&dev->chanA); if(intr&CHAEXT) irqs->status(&dev->chanA); } irqs=dev->chanB.irqs; if(intr & (CHBRxIP|CHBTxIP|CHBEXT)) { if(intr&CHBRxIP) irqs->rx(&dev->chanB); if(intr&CHBTxIP) irqs->tx(&dev->chanB); if(intr&CHBEXT) irqs->status(&dev->chanB); } } if(work==5000) printk(KERN_ERR "%s: interrupt jammed - abort(0x%X)!\n", dev->name, intr); /* Ok all done */ locker=0; } EXPORT_SYMBOL(z8530_interrupt); static char reg_init[16]= { 0,0,0,0, 0,0,0,0, 0,0,0,0, 0x55,0,0,0 }; int z8530_sync_open(struct device *dev, struct z8530_channel *c) { c->sync = 1; c->mtu = dev->mtu+64; c->count = 0; c->skb = NULL; c->skb2 = NULL; c->irqs = &z8530_sync; /* This loads the double buffer up */ z8530_rx_done(c); /* Load the frame ring */ z8530_rx_done(c); /* Load the backup frame */ z8530_rtsdtr(c,1); c->dma_tx = 0; c->regs[R1]|=TxINT_ENAB; write_zsreg(c, R1, c->regs[R1]); write_zsreg(c, R3, c->regs[R3]|RxENABLE); return 0; } EXPORT_SYMBOL(z8530_sync_open); int z8530_sync_close(struct device *dev, struct z8530_channel *c) { u8 chk; c->irqs = &z8530_nop; c->max = 0; c->sync = 0; chk=read_zsreg(c,R0); write_zsreg(c, R3, c->regs[R3]); z8530_rtsdtr(c,0); return 0; } EXPORT_SYMBOL(z8530_sync_close); int z8530_sync_dma_open(struct device *dev, struct z8530_channel *c) { unsigned long flags; c->sync = 1; c->mtu = dev->mtu+64; c->count = 0; c->skb = NULL; c->skb2 = NULL; /* * Load the DMA interfaces up */ c->rxdma_on = 0; c->txdma_on = 0; /* * Allocate the DMA flip buffers */ c->rx_buf[0]=kmalloc(c->mtu, GFP_KERNEL|GFP_DMA); if(c->rx_buf[0]==NULL) return -ENOBUFS; c->rx_buf[1]=kmalloc(c->mtu, GFP_KERNEL|GFP_DMA); if(c->rx_buf[1]==NULL) { kfree(c->rx_buf[0]); c->rx_buf[0]=NULL; return -ENOBUFS; } c->tx_dma_buf[0]=kmalloc(c->mtu, GFP_KERNEL|GFP_DMA); if(c->tx_dma_buf[0]==NULL) { kfree(c->rx_buf[0]); kfree(c->rx_buf[1]); c->rx_buf[0]=NULL; return -ENOBUFS; } c->tx_dma_buf[1]=kmalloc(c->mtu, GFP_KERNEL|GFP_DMA); if(c->tx_dma_buf[1]==NULL) { kfree(c->tx_dma_buf[0]); kfree(c->rx_buf[0]); kfree(c->rx_buf[1]); c->rx_buf[0]=NULL; c->rx_buf[1]=NULL; c->tx_dma_buf[0]=NULL; return -ENOBUFS; } c->tx_dma_used=0; c->dma_tx = 1; c->dma_num=0; c->dma_ready=1; /* * Enable DMA control mode */ /* * TX DMA via DIR/REQ */ c->regs[R14]|= DTRREQ; write_zsreg(c, R14, c->regs[R14]); c->regs[R1]&= ~TxINT_ENAB; write_zsreg(c, R1, c->regs[R1]); /* * RX DMA via W/Req */ c->regs[R1]|= WT_FN_RDYFN; c->regs[R1]|= WT_RDY_RT; c->regs[R1]|= INT_ERR_Rx; c->regs[R1]&= ~TxINT_ENAB; write_zsreg(c, R1, c->regs[R1]); c->regs[R1]|= WT_RDY_ENAB; write_zsreg(c, R1, c->regs[R1]); /* * DMA interrupts */ /* * Set up the DMA configuration */ flags=claim_dma_lock(); disable_dma(c->rxdma); clear_dma_ff(c->rxdma); set_dma_mode(c->rxdma, DMA_MODE_READ|0x10); set_dma_addr(c->rxdma, virt_to_bus(c->rx_buf[0])); set_dma_count(c->rxdma, c->mtu); enable_dma(c->rxdma); disable_dma(c->txdma); clear_dma_ff(c->txdma); set_dma_mode(c->txdma, DMA_MODE_WRITE); disable_dma(c->txdma); release_dma_lock(flags); /* * Select the DMA interrupt handlers */ c->rxdma_on = 1; c->txdma_on = 1; c->tx_dma_used = 1; c->irqs = &z8530_dma_sync; z8530_rtsdtr(c,1); write_zsreg(c, R3, c->regs[R3]|RxENABLE); return 0; } EXPORT_SYMBOL(z8530_sync_dma_open); int z8530_sync_dma_close(struct device *dev, struct z8530_channel *c) { u8 chk; unsigned long flags; c->irqs = &z8530_nop; c->max = 0; c->sync = 0; /* * Disable the PC DMA channels */ flags=claim_dma_lock(); disable_dma(c->rxdma); clear_dma_ff(c->rxdma); c->rxdma_on = 0; disable_dma(c->txdma); clear_dma_ff(c->txdma); release_dma_lock(flags); c->txdma_on = 0; c->tx_dma_used = 0; /* * Disable DMA control mode */ c->regs[R1]&= ~WT_RDY_ENAB; write_zsreg(c, R1, c->regs[R1]); c->regs[R1]&= ~(WT_RDY_RT|WT_FN_RDYFN|INT_ERR_Rx); c->regs[R1]|= INT_ALL_Rx; write_zsreg(c, R1, c->regs[R1]); c->regs[R14]&= ~DTRREQ; write_zsreg(c, R14, c->regs[R14]); if(c->rx_buf[0]) { kfree(c->rx_buf[0]); c->rx_buf[0]=NULL; } if(c->rx_buf[1]) { kfree(c->rx_buf[1]); c->rx_buf[1]=NULL; } if(c->tx_dma_buf[0]) { kfree(c->tx_dma_buf[0]); c->tx_dma_buf[0]=NULL; } if(c->tx_dma_buf[1]) { kfree(c->tx_dma_buf[1]); c->tx_dma_buf[1]=NULL; } chk=read_zsreg(c,R0); write_zsreg(c, R3, c->regs[R3]); z8530_rtsdtr(c,0); return 0; } EXPORT_SYMBOL(z8530_sync_dma_close); int z8530_sync_txdma_open(struct device *dev, struct z8530_channel *c) { printk("Opening sync interface for TX-DMA\n"); c->sync = 1; c->mtu = dev->mtu+64; c->count = 0; c->skb = NULL; c->skb2 = NULL; /* * Load the PIO receive ring */ z8530_rx_done(c); z8530_rx_done(c); /* * Load the DMA interfaces up */ c->rxdma_on = 0; c->txdma_on = 0; c->tx_dma_buf[0]=kmalloc(c->mtu, GFP_KERNEL|GFP_DMA); if(c->tx_dma_buf[0]==NULL) { kfree(c->rx_buf[0]); kfree(c->rx_buf[1]); c->rx_buf[0]=NULL; return -ENOBUFS; } c->tx_dma_buf[1]=kmalloc(c->mtu, GFP_KERNEL|GFP_DMA); if(c->tx_dma_buf[1]==NULL) { kfree(c->tx_dma_buf[0]); kfree(c->rx_buf[0]); kfree(c->rx_buf[1]); c->rx_buf[0]=NULL; c->rx_buf[1]=NULL; c->tx_dma_buf[0]=NULL; return -ENOBUFS; } c->tx_dma_used=0; c->dma_num=0; c->dma_ready=1; c->dma_tx = 1; /* * Enable DMA control mode */ /* * TX DMA via DIR/REQ */ c->regs[R14]|= DTRREQ; write_zsreg(c, R14, c->regs[R14]); /* * Set up the DMA configuration */ disable_dma(c->txdma); clear_dma_ff(c->txdma); set_dma_mode(c->txdma, DMA_MODE_WRITE); disable_dma(c->txdma); /* * Select the DMA interrupt handlers */ c->rxdma_on = 0; c->txdma_on = 1; c->tx_dma_used = 1; c->irqs = &z8530_txdma_sync; printk("Loading RX\n"); z8530_rtsdtr(c,1); printk("Rx interrupts ON\n"); write_zsreg(c, R3, c->regs[R3]|RxENABLE); return 0; } EXPORT_SYMBOL(z8530_sync_txdma_open); int z8530_sync_txdma_close(struct device *dev, struct z8530_channel *c) { u8 chk; c->irqs = &z8530_nop; c->max = 0; c->sync = 0; /* * Disable the PC DMA channels */ disable_dma(c->txdma); clear_dma_ff(c->txdma); c->txdma_on = 0; c->tx_dma_used = 0; /* * Disable DMA control mode */ c->regs[R1]&= ~WT_RDY_ENAB; write_zsreg(c, R1, c->regs[R1]); c->regs[R1]&= ~(WT_RDY_RT|WT_FN_RDYFN|INT_ERR_Rx); c->regs[R1]|= INT_ALL_Rx; write_zsreg(c, R1, c->regs[R1]); c->regs[R14]&= ~DTRREQ; write_zsreg(c, R14, c->regs[R14]); if(c->tx_dma_buf[0]) { kfree(c->tx_dma_buf[0]); c->tx_dma_buf[0]=NULL; } if(c->tx_dma_buf[1]) { kfree(c->tx_dma_buf[1]); c->tx_dma_buf[1]=NULL; } chk=read_zsreg(c,R0); write_zsreg(c, R3, c->regs[R3]); z8530_rtsdtr(c,0); return 0; } EXPORT_SYMBOL(z8530_sync_txdma_close); /* * Describe a Z8530 in a standard format. We must pass the I/O as * the port offset isnt predictable. The main reason for this function * is to try and get a common format of report. */ static char *z8530_type_name[]={ "Z8530", "Z85C30", "Z85230" }; void z8530_describe(struct z8530_dev *dev, char *mapping, int io) { printk(KERN_INFO "%s: %s found at %s 0x%X, IRQ %d.\n", dev->name, z8530_type_name[dev->type], mapping, Z8530_PORT_OF(io), dev->irq); } EXPORT_SYMBOL(z8530_describe); /* * Configure up a Z8530 */ int z8530_init(struct z8530_dev *dev) { /* NOP the interrupt handlers first - we might get a floating IRQ transition when we reset the chip */ dev->chanA.irqs=&z8530_nop; dev->chanB.irqs=&z8530_nop; /* Reset the chip */ write_zsreg(&dev->chanA, R9, 0xC0); udelay(200); /* Now check its valid */ write_zsreg(&dev->chanA, R12, 0xAA); if(read_zsreg(&dev->chanA, R12)!=0xAA) return -ENODEV; write_zsreg(&dev->chanA, R12, 0x55); if(read_zsreg(&dev->chanA, R12)!=0x55) return -ENODEV; dev->type=Z8530; /* * See the application note. */ write_zsreg(&dev->chanA, R15, 0x01); /* * If we can set the low bit of R15 then * the chip is enhanced. */ if(read_zsreg(&dev->chanA, R15)==0x01) { /* This C30 versus 230 detect is from Klaus Kudielka's dmascc */ /* Put a char in the fifo */ write_zsreg(&dev->chanA, R8, 0); if(read_zsreg(&dev->chanA, R0)&Tx_BUF_EMP) dev->type = Z85230; /* Has a FIFO */ else dev->type = Z85C30; /* Z85C30, 1 byte FIFO */ } /* * The code assumes R7' and friends are * off. Use write_zsext() for these and keep * this bit clear. */ write_zsreg(&dev->chanA, R15, 0); /* * At this point it looks like the chip is behaving */ memcpy(dev->chanA.regs, reg_init, 16); memcpy(dev->chanB.regs, reg_init ,16); return 0; } EXPORT_SYMBOL(z8530_init); int z8530_shutdown(struct z8530_dev *dev) { /* Reset the chip */ dev->chanA.irqs=&z8530_nop; dev->chanB.irqs=&z8530_nop; write_zsreg(&dev->chanA, R9, 0xC0); udelay(100); return 0; } EXPORT_SYMBOL(z8530_shutdown); /* * Load a Z8530 channel up from the system data * We use +16 to indicate the 'prime' registers */ int z8530_channel_load(struct z8530_channel *c, u8 *rtable) { while(*rtable!=255) { int reg=*rtable++; if(reg>0x0F) write_zsreg(c, R15, c->regs[15]|1); write_zsreg(c, reg&0x0F, *rtable); if(reg>0x0F) write_zsreg(c, R15, c->regs[15]&~1); c->regs[reg]=*rtable++; } c->rx_function=z8530_null_rx; c->skb=NULL; c->tx_skb=NULL; c->tx_next_skb=NULL; c->mtu=1500; c->max=0; c->count=0; c->status=0; /* Fixme - check DCD now */ c->sync=1; write_zsreg(c, R3, c->regs[R3]|RxENABLE); return 0; } EXPORT_SYMBOL(z8530_channel_load); /* * Higher level shovelling - transmit chains */ static void z8530_tx_begin(struct z8530_channel *c) { unsigned long flags; if(c->tx_skb) return; c->tx_skb=c->tx_next_skb; c->tx_next_skb=NULL; c->tx_ptr=c->tx_next_ptr; mark_bh(NET_BH); if(c->tx_skb==NULL) { /* Idle on */ if(c->dma_tx) { flags=claim_dma_lock(); disable_dma(c->txdma); /* * Check if we crapped out. */ if(get_dma_residue(c->txdma)) { c->stats.tx_dropped++; c->stats.tx_fifo_errors++; } release_dma_lock(flags); } c->txcount=0; } else { c->txcount=c->tx_skb->len; if(c->dma_tx) { /* * FIXME. DMA is broken for the original 8530, * on the older parts we need to set a flag and * wait for a further TX interrupt to fire this * stage off */ flags=claim_dma_lock(); disable_dma(c->txdma); /* * These two are needed by the 8530/85C30 * and must be issued when idling. */ if(c->dev->type!=Z85230) { write_zsctrl(c, RES_Tx_CRC); write_zsctrl(c, RES_EOM_L); } write_zsreg(c, R10, c->regs[10]&~ABUNDER); clear_dma_ff(c->txdma); set_dma_addr(c->txdma, virt_to_bus(c->tx_ptr)); set_dma_count(c->txdma, c->txcount); enable_dma(c->txdma); release_dma_lock(flags); write_zsctrl(c, RES_EOM_L); write_zsreg(c, R5, c->regs[R5]|TxENAB); } else { save_flags(flags); cli(); /* ABUNDER off */ write_zsreg(c, R10, c->regs[10]); write_zsctrl(c, RES_Tx_CRC); //??? write_zsctrl(c, RES_EOM_L); while(c->txcount && (read_zsreg(c,R0)&Tx_BUF_EMP)) { write_zsreg(c, R8, *c->tx_ptr++); c->txcount--; } restore_flags(flags); } } } static void z8530_tx_done(struct z8530_channel *c) { unsigned long flags; struct sk_buff *skb; spin_lock_irqsave(&z8530_buffer_lock, flags); c->netdevice->tbusy=0; /* Actually this can happen.*/ if(c->tx_skb==NULL) { spin_unlock_irqrestore(&z8530_buffer_lock, flags); return; } skb=c->tx_skb; c->tx_skb=NULL; z8530_tx_begin(c); spin_unlock_irqrestore(&z8530_buffer_lock, flags); c->stats.tx_packets++; c->stats.tx_bytes+=skb->len; dev_kfree_skb(skb); } /* * Higher level shovelling - receive chains */ void z8530_null_rx(struct z8530_channel *c, struct sk_buff *skb) { kfree_skb(skb); } EXPORT_SYMBOL(z8530_null_rx); static void z8530_rx_done(struct z8530_channel *c) { struct sk_buff *skb; int ct; /* * Is our receive engine in DMA mode */ if(c->rxdma_on) { /* * Save the ready state and the buffer currently * being used as the DMA target */ int ready=c->dma_ready; unsigned char *rxb=c->rx_buf[c->dma_num]; unsigned long flags; /* * Complete this DMA. Neccessary to find the length */ flags=claim_dma_lock(); disable_dma(c->rxdma); clear_dma_ff(c->rxdma); c->rxdma_on=0; ct=c->mtu-get_dma_residue(c->rxdma); if(ct<0) ct=2; /* Shit happens.. */ c->dma_ready=0; /* * Normal case: the other slot is free, start the next DMA * into it immediately. */ if(ready) { c->dma_num^=1; set_dma_mode(c->rxdma, DMA_MODE_READ|0x10); set_dma_addr(c->rxdma, virt_to_bus(c->rx_buf[c->dma_num])); set_dma_count(c->rxdma, c->mtu); c->rxdma_on = 1; enable_dma(c->rxdma); /* Stop any frames that we missed the head of from passing */ write_zsreg(c, R0, RES_Rx_CRC); } else /* Can't occur as we dont reenable the DMA irq until after the flip is done */ printk("DMA flip overrun!\n"); release_dma_lock(flags); /* * Shove the old buffer into an sk_buff. We can't DMA * directly into one on a PC - it might be above the 16Mb * boundary. Optimisation - we could check to see if we * can avoid the copy. Optimisation 2 - make the memcpy * a copychecksum. */ skb=dev_alloc_skb(ct); if(skb==NULL) { c->stats.rx_dropped++; printk(KERN_WARNING "%s: Memory squeeze.\n", c->netdevice->name); } else { skb_put(skb, ct); memcpy(skb->data, rxb, ct); c->stats.rx_packets++; c->stats.rx_bytes+=ct; } c->dma_ready=1; } else { RT_LOCK; skb=c->skb; /* * The game we play for non DMA is similar. We want to * get the controller set up for the next packet as fast * as possible. We potentially only have one byte + the * fifo length for this. Thus we want to flip to the new * buffer and then mess around copying and allocating * things. For the current case it doesn't matter but * if you build a system where the sync irq isnt blocked * by the kernel IRQ disable then you need only block the * sync IRQ for the RT_LOCK area. * */ ct=c->count; c->skb = c->skb2; c->count = 0; c->max = c->mtu; if(c->skb) { c->dptr = c->skb->data; c->max = c->mtu; } else { c->count= 0; c->max = 0; } RT_UNLOCK; c->skb2 = dev_alloc_skb(c->mtu); if(c->skb2==NULL) printk(KERN_WARNING "%s: memory squeeze.\n", c->netdevice->name); else { skb_put(c->skb2,c->mtu); } c->stats.rx_packets++; c->stats.rx_bytes+=ct; } /* * If we received a frame we must now process it. */ if(skb) { skb_trim(skb, ct); c->rx_function(c,skb); } else { c->stats.rx_dropped++; printk(KERN_ERR "%s: Lost a frame\n", c->netdevice->name); } } /* * Cannot DMA over a 64K boundary on a PC */ extern inline int spans_boundary(struct sk_buff *skb) { unsigned long a=(unsigned long)skb->data; a^=(a+skb->len); if(a&0x00010000) /* If the 64K bit is different.. */ { printk("spanner\n"); return 1; } return 0; } /* * Queue a packet for transmission. Because we have rather * hard to hit interrupt latencies for the Z85230 per packet * even in DMA mode we do the flip to DMA buffer if needed here * not in the IRQ. */ int z8530_queue_xmit(struct z8530_channel *c, struct sk_buff *skb) { unsigned long flags; if(c->tx_next_skb) { skb->dev->tbusy=1; return 1; } /* PC SPECIFIC - DMA limits */ /* * If we will DMA the transmit and its gone over the ISA bus * limit, then copy to the flip buffer */ if(c->dma_tx && ((unsigned long)(virt_to_bus(skb->data+skb->len))>=16*1024*1024 || spans_boundary(skb))) { /* * Send the flip buffer, and flip the flippy bit. * We don't care which is used when just so long as * we never use the same buffer twice in a row. Since * only one buffer can be going out at a time the other * has to be safe. */ c->tx_next_ptr=c->tx_dma_buf[c->tx_dma_used]; c->tx_dma_used^=1; /* Flip temp buffer */ memcpy(c->tx_next_ptr, skb->data, skb->len); } else c->tx_next_ptr=skb->data; RT_LOCK; c->tx_next_skb=skb; RT_UNLOCK; spin_lock_irqsave(&z8530_buffer_lock, flags); z8530_tx_begin(c); spin_unlock_irqrestore(&z8530_buffer_lock, flags); return 0; } EXPORT_SYMBOL(z8530_queue_xmit); struct net_device_stats *z8530_get_stats(struct z8530_channel *c) { return &c->stats; } EXPORT_SYMBOL(z8530_get_stats); #ifdef MODULE /* * Module support */ int init_module(void) { printk(KERN_INFO "Generic Z85C30/Z85230 interface driver v0.02\n"); return 0; } void cleanup_module(void) { } #endif